20023918 has 4 divisors (see below), whose sum is σ = 30035880. Its totient is φ = 10011958.

The previous prime is 20023907. The next prime is 20023931. The reversal of 20023918 is 81932002.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 20023892 and 20023901.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5005978 + ... + 5005981.

It is an arithmetic number, because the mean of its divisors is an integer number (7508970).

Almost surely, 2^20023918 is an apocalyptic number.

20023918 is a deficient number, since it is larger than the sum of its proper divisors (10011962).

20023918 is a wasteful number, since it uses less digits than its factorization.

20023918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10011961.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 20023918 is about 4474.8092696784. The cubic root of 20023918 is about 271.5499242880.

The spelling of 20023918 in words is "twenty million, twenty-three thousand, nine hundred eighteen".